One of Jimmy Fallon’s recurring segments, “Pros and Cons,” finds him listing, well, the pros and cons of various topics. On last night’s episode of The Tonight Show, Fallon chose to examine a scientific topic—the Hyperloop. First conceived by Elon Musk, the Hyperloop is a high-speed, magnetically levitated train that travels over 700 mph inside a sealed tube. Fallon chose the topic because a Hyperloop motor was successfully tested in the Nevada desert last week.

After quite a bit of joking about how future viewers will make fun of Fallon for not knowing what a Hyperloop is, the actual pros and cons list starts around 2:22 (don’t worry—the embedded clip starts right at the beginning of the list).

To learn more about Hyperloop, check out Popular Science‘s full coverage of the subject.